[Bug c++/71577] New: ICE on invalid C++11 code (with extra struct initializer) on x86_64-linux-gnu: in digest_init_r, at cp/typeck2.c:1117

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71577

            Bug ID: 71577
           Summary: ICE on invalid C++11 code (with extra struct
                    initializer) on x86_64-linux-gnu: in digest_init_r, at
                    cp/typeck2.c:1117
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu
  Target Milestone: ---

The following C++11 code causes an ICE when compiled with the current GCC trunk
on x86_64-linux-gnu in both 32-bit and 64-bit modes.  

It is a regression from 6.1.x. 


$ g++-trunk -v
Using built-in specs.
COLLECT_GCC=g++-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/7.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/usr/local/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 7.0.0 20160617 (experimental) [trunk revision 237557] (GCC) 
$ 
$ g++-6.1 -c small.cpp
small.cpp:1:36: error: too many initializers for ‘<anonymous struct>’
 struct { int a; } s1, s2 = { s1, 0 };
                                    ^
small.cpp:1:36: error: cannot convert ‘<anonymous struct>’ to ‘int’ in
initialization
$ 
$ g++-trunk -c small.cpp
small.cpp:1:36: error: too many initializers for ‘<anonymous struct>’
 struct { int a; } s1, s2 = { s1, 0 };
                                    ^
small.cpp:1:36: internal compiler error: in digest_init_r, at cp/typeck2.c:1117
0x726db8 digest_init_r
        ../../gcc-source-trunk/gcc/cp/typeck2.c:1117
0x72839a digest_init_flags
        ../../gcc-source-trunk/gcc/cp/typeck2.c:1167
0x72839a store_init_value(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>**, int)
        ../../gcc-source-trunk/gcc/cp/typeck2.c:796
0x687abc check_initializer
        ../../gcc-source-trunk/gcc/cp/decl.c:6193
0x6b1c0d cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
        ../../gcc-source-trunk/gcc/cp/decl.c:6851
0x7ac1a7 cp_parser_init_declarator
        ../../gcc-source-trunk/gcc/cp/parser.c:18697
0x7ac9d9 cp_parser_simple_declaration
        ../../gcc-source-trunk/gcc/cp/parser.c:12378
0x7acce1 cp_parser_block_declaration
        ../../gcc-source-trunk/gcc/cp/parser.c:12246
0x7b60c0 cp_parser_declaration
        ../../gcc-source-trunk/gcc/cp/parser.c:12143
0x7b4b94 cp_parser_declaration_seq_opt
        ../../gcc-source-trunk/gcc/cp/parser.c:12022
0x7b4ec8 cp_parser_translation_unit
        ../../gcc-source-trunk/gcc/cp/parser.c:4324
0x7b4ec8 c_parse_file()
        ../../gcc-source-trunk/gcc/cp/parser.c:37486
0x918e02 c_common_parse_file()
        ../../gcc-source-trunk/gcc/c-family/c-opts.c:1070
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
$ 


------------------------------------------------------------

// valid in C++11 & okay: struct { int a; } s1, s2 = { s1 }; 
struct { int a; } s1, s2 = { s1, 0 };